Marstek Venus E (5.12kWh), this plug-in model has gained a lot of popularity the last couple of months in some European markets like Belgium, Germany, and the Netherlands. It has a maximum charge rate of 2500W and can discharge at up to 2500W (should be connected to a separate power group and only if local regulations allow it). These kind of batteries plug into a regular AC socket and do not require an electrical inspection. But they aren't legal everywhere.

In my case, it's configured to track the readings of my digital electricity meter. The battery charges itself when my solar panels produce excess power and discharges when it detects grid consumption. Throughout the day, it buffers the intermittent solar power, and during the evening, night, and early morning hours, it keeps my grid power consumption close to zero.